Blue are the real problem in this scenario because if you give them an inch they will take 100000000 miles and then this becomes impossible. Even if they get castles up you will still easily be able to be able to destroy them. They will send over knights, two hand swordsmans and trebuchets at the same time as you are preparing to attack green. The game will trigger your ally to attack an enemy after a certain time (15-20 minutes I think) and if you still have Holy Roman Empire (blue) around then they will go to them and get absolutely slaughtered. IGNORE THE VISGOTHS (GREEN) AT THE START.
